I use the 3M Black talc Dust, it does not clog expensive sand paper.
The 3M Black talc is cheaper to use then rattle cans. Consider how expensive sand paper is these days you will use 1/2 as much.
I noticed "white" powder is also available. I'm going to paint an F8 green RR and a B5 blue Dart. Would the "white" be a better choice? Tks.
I've not used the white myself, but I imagine it wouldn't show up very well when cutting the clear coat.